APEX RF-5050 Replacement Filter, 5 Piece 5-PIECE REPLACEMENT FILTERS: APEX RF-5050 Replacement Filter Kit is a 5-piece replacement filter set for your APEX MR-5050. The kit includes each of the 5 stage reverse osmosis water filters: the 5-micron pre-filter, two solid 10 block carbon block filters, one thin film composite (TFC) RO membrane, and the granular activated carbon (GAC) polishing filter for APEX MR-5050 water filter systems. MONEY SAVING MULTI-PACK: By purchasing APEXs 5 Piece Replacement Filter Kit, you save more money than ordering separately. When you purchase APEXs Reverse Osmosis Water Filtering System, you will occasionally need to replace the filters for optimal filtering performance. By ordering the replacement filter kit, you receive each of the important 5 stage filters at a more economical price. IMPORTANT FOR MAINTENANCE: APEX Water Filter Systems work hard to give you clean, filtered drinking water for your home or office. Occasionally, the filters need to be replaced to ensure the filtering system continues to work efficiently and properly. New replacement filters are a normal part of the important routine needed for maintenance and optimal performance of your home water purification system. GUARANTEED TO FIT PROPERLY: When you order APEX water filter replacement cartridges, you are guaranteed to get the correct replacement filters that will properly fit your home water filter system by APEX. Dont waste valuable time and money trying to guess which size and type is the right fit for your APEX MR- 5050 model 5-stage reverse osmosis water filter system. MADE IN THE USA: Proudly made in the USA, APEX makes all of their products according to the National Safety Foundation certified water filter safety standards and requirements. By following the strict guidelines of the NSF and the FDA, we ensure that the water your family drinks is completely safe and healthy. Let APEX clean and protect your drinking water so you dont have to worry about it.